18405316 has 12 divisors (see below), whose sum is σ = 32374188. Its totient is φ = 9155552.

The previous prime is 18405301. The next prime is 18405329. The reversal of 18405316 is 61350481.

It can be written as a sum of positive squares in 2 ways, for example, as 16842816 + 1562500 = 4104^2 + 1250^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10891 + ... + 12466.

It is an arithmetic number, because the mean of its divisors is an integer number (2697849).

Almost surely, 2^18405316 is an apocalyptic number.

It is an amenable number.

18405316 is a deficient number, since it is larger than the sum of its proper divisors (13968872).

18405316 is a wasteful number, since it uses less digits than its factorization.

18405316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23558 (or 23556 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 18405316 is about 4290.1417226008. The cubic root of 18405316 is about 264.0266463768.

Adding to 18405316 its reverse (61350481), we get a palindrome (79755797).

It can be divided in two parts, 18405 and 316, that added together give a triangular number (18721 = T₁₉₃).

The spelling of 18405316 in words is "eighteen million, four hundred five thousand, three hundred sixteen".